Apple IIe - Page 83

Apple
BASIC
Reference
Guide
83
AND
would
treat
it
as
true.
The
following
is
the
truth
table
for
AND
.
x
y
XANDY
true
true
true
true
false
false
false
true
false
false false false
In
both
Applesoft
and
Integer
BASIC,
a
true
is
represented
by a 1
and
false
by a
0.
10
A=
2
20
B
=3
Example 1
30
IF
(A=
2)
AND
(B
=
3)
THEN
60
40
PRINT"
AND
FAILED
LOGICAL
TEST"
50
GOTO
70
60
PRINT
"AND
PASSED
LOGICAL
TEST"
70
END
]RUN
[Ret]
AND
PASSED
LOGICAL
TEST
In
the
preceding
example
,
line
30
first tested
the
value
of
A. Since
A was set
equal
to
2
in
line
10,
the
first
expression
was
evaluated
as
true.
The
value
of
B was
then
tested.
It
too
evaluated
as
true
.
Using
the
logical
AND
table,
if
expression1
and
expression2
evaluated
to
true,
then
the
whole
AND
expression
evaluated
as
true
. The
program
will
then
execute
the
THEN
portion
of
the
statement and
will
branch
to
line
60
.
At
line
60
,
the
message
AND
PASSED
LOGICAL
TEST
was
displayed.
Example
2
PRINT
(3=1+2)
AND
(-
5)
1
In
this
example
,
3
is
set
equal
to
1 + 2,
so
the
first
expression